Back-pedaling coaster-brake.



F. S. BLLBTT. BACK PEDALING coAsTBB BRAKE.

APPLICATION FILED HOV. 18. 1908.

Patented Aug. 3,1909.

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UNITED` STATES PATENT OFFICE.

FREDERICK S. ELLETT, OF ELMIRA, NEW YORK, ASSIGNOR TO ECLIPSE MACHINE COMPANY.

OF ELMIRA, NEW YORK, A CORPORATION OF NEWJQRK.

BACK-PEDALING COASTER-BRAKE.

' Specification of Letters Patent.

Patented Aug. 3, 1909.

To ail whom 'it Imay concern.' l

Be it known that I, FREDERICK S. ELLETT, a 'citizen of the United States. and resident ot' Elmira. in the county of Chemung and State ot' New York, have invented certain new and useful Improvements in Back- Iedlaling Coaster-Brakes, of which the following is a specification.

This invention relates to backpedaling coaster' brakesand its object is to dispense with the brakcarm ordinarily used for holding the'brake member against rotation.

In the drawings Figure l is a central, longitudinal section of thecomplete device; i"ig. 2 1s a similar section of the hub, showing its contents; and Figs.r 3 to 5, inclusive, are different views of one of the parts.

Thespeciiic means shown in the drawings for retaining the nonrotary brake .ineinher against rotation consists ot' a lockwasher with parallel ribs on its inner face, and a centrally located lug that is adapted to be placed upon the axle outside the bicycle frame, and by projecting through the fork and engaging the nonrotary brake mem ber, so to secure the latter that it cannot rotate on back pedaling. In the drawings tiled herewith this lock-washer is shown 1n connection with the coaster brake mechanism that is described in my pending application Serial No. 430,400, filed May 1, 1908, and is, in fact, the same washer indicated In View of this fact, it is unnecessary to descrlbe in detail the vdriving and braking mechanism, shown in these drawings, but only sufficiently' to make clear how the improvements that are the subject of this application coperate with the nonrotary member of any brake mechanism, whatever its form or construction may be, in order to hold it against rotation during the operation of applying the brake. i Briefly then, the parts numbered 1 to 7, inclusive, and 14 to 27, inclusive, are those parts of the coasterv brake device that are de- :scribed in detail in my said application Serial No. 430,400, while the parts numbered 8 to 13, inclusive, are the nonrotary brake member and the means for retaining 1t against rotation; S is the nonrotary brake element; 9 the lock-washer; 10 a lug 011 the inner face of the washer, that is adapted to pass through the usual slot in the end of the rear fork 11 of the veloclpede frame, and

enter a corresponding recess 12 in the nonrotary brake member, which thus presents a lshoulder on each side of the lug; and 13 ribs on the inner :tace of the washer to engage the outer side of the fork.

N ot only does the projection 10 that connects the washer and brake element itself hold the latter against rotation on ,back pedaling, because it engages the velocipede frame as well as the brake element, but it also the means of utilizing the friction between the washer and the frame to resist the torsion on the'brake element on back pedaling, because it connects the washer nonrotatably with said brake element. This is important for the force brought to bear upon the lug on back pedaling is sutlicient at times to break a lug of moderate size, and may' spread the fork, when the lug is passed through the slot in it, as shown in the drawings, it' some resistance such as that otlered by the washer is not added to that ofthe lug. Again, both the ribs 1I, on the inner face of the washer, and the ribs 32 on the outer face of the brake-element, both of which engage the velocipede frame, are made in the form of raised, sharp edges, on each side of the lug, that are parallel with each other andalso with the lug. vThese ribs, or edges, take hold of the fork on each side of the slot, and resist the tendency of the lug to spread it on powerful back pedaling. `When the ribs bite into the fork, as they do in practice, they make sockets for themselves in the fork that i greatly help to resist the spreading tendency of the fork under strain. These ribs on the washer also increase the friction between the washer and the fork for the purpose before mentioned, and the connection between washer and brake element insures that the ribs on both Will always lie parallel with the `slot, which is the position in which they are most effective. Finally, this form of lock establishes a definite position for the brake member, since the recess must always be opposite to the slot in the fork. In some brakes this is a consideration, as in the case of ,the brake shown, where the lever may fall out of the slot where it lies between the edges of the expansible shell 14, unless the parts are-so locked in place that the lever lies uppermost, as shown 1n' the drawings.

What I claim is r- 1. In a coaster brake, the combinatlga'a with a supporting frame, of :in-axle carried thereby; ahb; a hrake element and a. washer, Said brake element and Washer be- I y ing mounted on the axle one on each side of slot, of an vwasher ,on ame, having l an inwardly exand adjacentto the supporting f1-ame, one of said parts having a, shoulder, and Vthe other having a locking projectionengaging both the shoulder on the other part and the intervenin frame; substantially as shown "and descri ed.

f2. In a 4 coaster brake, .the combination with a supporting frame, having an angular Slot, lof an axle extending therethrough.; a hub; a Brake element and a Washer,said Brake element and Washer being mounted on the Aa'xlefone on Jeach side of and adjacent'to the sipporting frame, oneof said partshavfing a slibulder, andthe other a locking protending projection adapted toregister with saidslot in the frame and extend beyond it;

d afbrake member recessed to receive said ection and having a shoulder to engage ereby the brake member is held against rotation; substantially shoyvn and scribed..

4. In a 'coaster brake mechanism,v the frame or fork, of a-brake element on one side ofl/saidfork, and a Washer on the other side of said fork, one of said last mentioned 4combination withn a bifurcated supporting.

parts-having parallel ribs that are adapted to lie parallel with and engage said fork on both sidesof its slot; andlocking means extending through said slot' and positively connecting the Washer and brake element against rotation relativeto the frame; lsubstantially as shown and described.4

5. In a coaster brake, the combination with a bifurcated supporting frame, of -an yaxlecarried therein; a hub; a. brake element and a. Washer,t adapted `to -lie one on each side of and adjacent to the lsupportlng frame, one of said parts'ha'ving ribs that are parallel .with the arms of the4 frame, and para'llel with each other, one of said parts having a' shoulder; and a. projection from one of said-parts, adapted to engage both said yframe and said shoulder onv the other part;

, substantially as shown and described.

' FREDERICK S. yELLET'I Witnesses: Y .v D. L. WHITTIER, f A.. C. Rien.v 

